This is pretty easy, it's only stage 3 to get to this point and you have a chance to pick up a weapon bonus that will greatly improve your chances, just focus on avoiding enemy shots and them running into you.Tough Guy10 Make it to stage 7 without obtaining any bonus weapons.

Simple as it sounds, just avoid shooting the bonus maker and do your best to stay alive.Good Start10 Get 12,000 points in the first stage.

A relatively difficult cheeve that requires some practice and memorization. You get more points for eliminating an entire wave before it moves away from you. Should stay in a spot and blast away in this order.
1st - Stay at start
2nd - Move to the lower right
3rd - Move to the lower left
4th - Move directly to the top
5th - After this point the last wave or two seems to come at random.Sharp Shooter10 Kill all ships on the first 3 bonus levels.

This is rather difficult and will require a lot of practice and memorization. Having the bonus weapon will help destroy more enemies.Exploring Uranus10 Make it to Uranus.
LAWL Exploring UR ANUS they are so clever!See "Mother Earth"Exploring Saturn20 Make it to Saturn.

See "Mother Earth"Exploring Jupiter20 Make it to Jupiter

See "Mother Earth"Mars Attack30 Make it to Mars

See "Mother Earth"Mother Earth30 Make it to Earth

So basically all of these planet cheeves are the same, just like most arcades, just continue on until on the next set of stages, but these get progressively harder and will require more practice and memorization to complete.Partnership10 Obtain a score of 60,000 during an Xbox Live Co-op game.

This is relatively easy and you and your partner should be able to get it quickly.Team Work20 Obtain a score of 200,000 during an Xbox Live Co-op game.

Funny thing about how I got this was that my partner had died off very early and I survived almost up to mars and still got the 200k for both of us, so it's 200k total not per player.Too Good20 Win 50 Xbox Live Versus games.

This is definitely a dumb cheeve because you can only get wins by playing player matches only (no private games either) and quiting out doesn't work, so fastest strategy is to just have your partner kill himself as quickly as possible.